body {
    color: #000;
    background-color: #e6e6e6;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%;
    background: url(https://images.cnblogs.com/cnblogs_com/lzklzk/1928443/o_210205130608u=2907933203,1950231697&fm=26&gp=0.jpg)fixed;
opacity:0.8;


}